Abstract: With the development of Beijing city,more and more bamboo plants are applied to the beautification of urban greening construction projects. At the same time,the harm of pests and pathogenic microorganisms is also a problem in the bamboo application. Therefore,in order to solve this problem,it is very necessary to the systematically and comprehensively identify the harmful organisms of bamboos,and to investigate their basic rule. From 2017 to 2020,in Beijing,the harmful organisms of bamboo plants in some parks,green belts along the second and third ring roads,the special zones of Beijing Botanical Garden,the green spaces in hospitals and communities were investigated. After classification and identification,there found totally 33 species of bamboo pests in Beijing,including 22 species of insect pests(7 species of scale insects,2 species of aphids,2 species of mites,3 species of bee,1 species of moth,1 species of weevil,1 species of fly,1 species of leafhopper,1 species of wax cicada,2 species of bugs,1 species of warthog),and 8 species of pathogenic microorganisms. Of which,15 species of pests and 8 species of pathogenic microorganisms were newly reported. Four categories of natural enemies (2 species of lacewing flies,3 species of aphid-eating flies,1 species of parasitic wasps,and 4 species of ladybugs) of these pests were found. The results of the investigation can provide a reference for the introduction and cultivation,conservation management and pest control of bamboo in Beijing.